I didn't bother with the plates, the work installing them is not work the 2.5 lb weight savings. With the "marble" mod, if you need to get the bike smog tested, it takes a few minutes to reverse and put back together, and the net result is identical with the exception of the 2.5 lbs. The whole point of the pair valve is to help the bike meet EPA emmisions standards, by adding fresh air to outgoing exhaust. At least with the marble trick you will see in this thread, you don' have to reinstall the pair valve for it to pass. Here is the thread.
http://www.hayabusa.org/cgi-bin....t=23476